[PATCH 1/3] block: Remove redundant parent blkcg_gp check in check_scale_change

[Kemeng Shi]

Function blkcg_iolatency_throttle will make sure blkg->parent is not
NULL before calls check_scale_change. And function check_scale_change
is only called in blkcg_iolatency_throttle.

Signed-off-by: Kemeng Shi <shikemeng@xxxxxxxxxx>
---
 block/blk-iolatency.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/block/blk-iolatency.c b/block/blk-iolatency.c
index e285152345a2..a8cc5abe91e5 100644
--- a/block/blk-iolatency.c
+++ b/block/blk-iolatency.c
@@ -403,9 +403,6 @@ static void check_scale_change(struct iolatency_grp *iolat)
 	u64 scale_lat;
 	int direction = 0;
 
-	if (lat_to_blkg(iolat)->parent == NULL)
-		return;
-
 	parent = blkg_to_lat(lat_to_blkg(iolat)->parent);
 	if (!parent)
 		return;
-- 
2.30.0